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Abstract

Methods are described which lead to reduced glare from high-capacity, reflective, liquid crystal displays allowing increased readability. Not only is glare reduced, but durability is improved as well. The twisted nematic liquid crystal display (LCD), shown in Fig. 1, consists of many layers of material that are laminated together, as illustrated in Fig. 2. As can be seen, the outer surface is a polarizer made of plastic. Being plastic, this surface tends to be shiny and easy to scratch. It is very undesirable to have a display that has poor durability and creates glare. To protect the polarizer, a non-bonded hardened plastic layer (usually PLEXIGLASS*) is a common solution used in the industry. However, without bonding to the polarizer, an air gap is created between this new layer and the polarizer behind it.

Country

United States

Language

English (United States)

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This is the abbreviated version, containing approximately
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Methods are described which lead to reduced glare from
high-capacity, reflective, liquid crystal displays allowing increased
readability. Not only is glare reduced, but durability is improved
as well. The twisted nematic liquid crystal display (LCD), shown in
Fig. 1, consists of many layers of material that are laminated
together, as illustrated in Fig. 2. As can be seen, the outer
surface is a polarizer made of plastic. Being plastic, this surface
tends to be shiny and easy to scratch. It is very undesirable to
have a display that has poor durability and creates glare. To protect
the polarizer, a non-bonded hardened plastic layer (usually
PLEXIGLASS*) is a common solution used in the industry. However,
without bonding to the polarizer, an air gap is created between this
new layer and the polarizer behind it. This air gap acts as another
source of glare since it causes internal reflections, even if the
outer (first) surface is treated to reduce glare. Since reflective
LCDs are passive devices, they require ambient light to pass through
all the layers and reflect back out in order to be readable. In
fact, the more light that passes through the LCD, the easier it is to
read. Unfortunately though, if this ambient light is reflecting off
either the outer surface or an internal surface before reaching the
reflector, this produces glare and lowers contrast, thus leading to a
reduction in readability. If the glare is excessive, it may make the
display totally unreadable. Thu...